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#include "QxGuideCircle.hpp"

static float PI2 = 2*3.1415f;

QxGuideCircle::QxGuideCircle( const QRectF& rect, float startAngle, float span, DIRECTION dir, QxGuide* follows) : QxGuide( follows )
{
  this->radiusX = rect.width() / 2.0;
  this->radiusY = rect.height() / 2.0;
  this->posX = rect.topLeft().x();
  this->posY = rect.topLeft().y();
  this->spanRad = span * PI2 / -360.0;
  if( dir == CCW ) {
    this->startAngleRad = startAngle * PI2 / -360.0;
    this->endAngleRad = startAngleRad + spanRad;
    this->stepAngleRad = this->spanRad / this->length();
  } else {
    this->startAngleRad = spanRad + (startAngle * PI2 / -360.0);
    this->endAngleRad = startAngle * PI2 / -360.0;
    this->stepAngleRad = -this->spanRad / this->length();
  }
}

float QxGuideCircle::length()
{
  return qAbs( this->radiusX * spanRad );
}

QPointF QxGuideCircle::startPos()
{
  return QPointF((posX + radiusX + radiusX * cos(startAngleRad)) * scaleX,
                 (posY + radiusY + radiusY * sin(startAngleRad)) * scaleY);
}

QPointF QxGuideCircle::endPos()
{
  return QPointF((posX + radiusX + radiusX * cos(endAngleRad)) * scaleX,
                 (posY + radiusY + radiusY * sin(endAngleRad)) * scaleY);
}

void QxGuideCircle::guide( QxDemoItem* item, float moveSpeed )
{
  float frame = item->guideFrame - this->startLength;
  QPointF end((posX + radiusX + radiusX * cos(startAngleRad + (frame * stepAngleRad))) * scaleX,
              (posY + radiusY + radiusY * sin(startAngleRad + (frame * stepAngleRad))) * scaleY);
  this->move( item, end, moveSpeed );
}
